Studies on Inhaled Air Trapping Effect of Japanese Bedding as a Risk of Sudden Infant Death Using an Infant Mannequin

一些日本的床上用品是在假定空气滞留的情况下进行评估的。在模拟呼吸过程中，使用二氧化碳分析仪监测了放在床上的人体模型呼吸道中二氧化碳浓度的变化。为了比较不同垫层之间的CO2扩散水平，采用了CO2半衰期(t1/2)值。T1/2值是通过测量过期的二氧化碳百分比达到呼气末二氧化碳初始百分比的一半所需的时间来计算的。当娃娃脸朝下放在床上时，所有的t1/2值都比仰卧位增加。就目前的婴儿蒲团(硬床垫类型)而言，与柔软的蒲团相比，再次呼吸的可能性可能相对较低。在每种情况下，通过在蒲团上铺上毛巾来延长T1/2值。二氧化碳的分散不仅取决于蒲团的柔软程度，还取决于床单/毛巾和床垫的结合。在所有卧具中，面朝下卧位再呼吸的可能性较大，仰卧位是最好的二氧化碳散布位置。

Some Japanese bedding were assessed on the assumption of the effects of air trapping. The change of CO2 concentration in the airway of a mannequin placed on bedding was monitored using a CO2 analyzer during simulated breathing. To compare the level of CO2 dispersal among different items of bedding, CO2 half time (t1/2) values were used. The t1/2 values were calculated by measuring the time required for the expired percent CO2 to reach 1/2 the initial percent end-tidal PCO2. When the doll was placed face down on the bedding, all t1/2 values increased in comparison with those of supine position. With respect to present baby futon (hard mattress type), there may be a relatively low potential for rebreathing to occur, compared with soft futon. In every case, the t1/2 value was prolonged by the use of a towel spread on the futon. CO2 dispersal may depend not only on the softness of the futon, but on the combination of bottom sheet/towel and mattress. The potential of rebreathing increased in face down position among all bedding, and supine position was the best CO2 dispersal position.